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218bc53dc7
Thanks to Lars for finding this.
The free of the 'attached_buffers' array should be done as late as
possible. This change moves it to iio_buffers_put(), which looks like
the best place for it, since it takes place right before the IIO device
data is free'd.
The free of this array will be handled by calling iio_device_free().
The iio_buffers_put() function is renamed to iio_device_detach_buffers()
since the role of this function changes a bit.
It looks like this issue was ocurring on the error path of
iio_buffers_alloc_sysfs_and_mask() and in
iio_buffers_free_sysfs_and_mask()
Added a comment in the doc-header of iio_device_attach_buffer() to
mention how this will be free'd in case anyone is reading the code
and becoming confused about it.
Fixes: ee708e6baa ("iio: buffer: introduce support for attaching more IIO buffers")
Reported-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Alexandru Ardelean <ardeleanalex@gmail.com>
Link: https://lore.kernel.org/r/20210307185444.32924-1-ardeleanalex@gmail.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
107 lines
3.1 KiB
C
107 lines
3.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/* The industrial I/O core function defs.
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*
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* Copyright (c) 2008 Jonathan Cameron
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*
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* These definitions are meant for use only within the IIO core, not individual
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* drivers.
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*/
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#ifndef _IIO_CORE_H_
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#define _IIO_CORE_H_
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#include <linux/kernel.h>
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#include <linux/device.h>
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struct iio_buffer;
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struct iio_chan_spec;
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struct iio_dev;
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extern struct device_type iio_device_type;
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struct iio_dev_buffer_pair {
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struct iio_dev *indio_dev;
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struct iio_buffer *buffer;
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};
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#define IIO_IOCTL_UNHANDLED 1
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struct iio_ioctl_handler {
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struct list_head entry;
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long (*ioctl)(struct iio_dev *indio_dev, struct file *filp,
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unsigned int cmd, unsigned long arg);
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};
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long iio_device_ioctl(struct iio_dev *indio_dev, struct file *filp,
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unsigned int cmd, unsigned long arg);
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void iio_device_ioctl_handler_register(struct iio_dev *indio_dev,
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struct iio_ioctl_handler *h);
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void iio_device_ioctl_handler_unregister(struct iio_ioctl_handler *h);
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int __iio_add_chan_devattr(const char *postfix,
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struct iio_chan_spec const *chan,
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ssize_t (*func)(struct device *dev,
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struct device_attribute *attr,
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char *buf),
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ssize_t (*writefunc)(struct device *dev,
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struct device_attribute *attr,
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const char *buf,
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size_t len),
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u64 mask,
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enum iio_shared_by shared_by,
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struct device *dev,
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struct iio_buffer *buffer,
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struct list_head *attr_list);
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void iio_free_chan_devattr_list(struct list_head *attr_list);
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int iio_device_register_sysfs_group(struct iio_dev *indio_dev,
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const struct attribute_group *group);
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ssize_t iio_format_value(char *buf, unsigned int type, int size, int *vals);
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/* Event interface flags */
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#define IIO_BUSY_BIT_POS 1
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#ifdef CONFIG_IIO_BUFFER
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struct poll_table_struct;
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__poll_t iio_buffer_poll_wrapper(struct file *filp,
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struct poll_table_struct *wait);
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ssize_t iio_buffer_read_wrapper(struct file *filp, char __user *buf,
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size_t n, loff_t *f_ps);
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int iio_buffers_alloc_sysfs_and_mask(struct iio_dev *indio_dev);
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void iio_buffers_free_sysfs_and_mask(struct iio_dev *indio_dev);
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#define iio_buffer_poll_addr (&iio_buffer_poll_wrapper)
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#define iio_buffer_read_outer_addr (&iio_buffer_read_wrapper)
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void iio_disable_all_buffers(struct iio_dev *indio_dev);
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void iio_buffer_wakeup_poll(struct iio_dev *indio_dev);
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void iio_device_detach_buffers(struct iio_dev *indio_dev);
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#else
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#define iio_buffer_poll_addr NULL
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#define iio_buffer_read_outer_addr NULL
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static inline int iio_buffers_alloc_sysfs_and_mask(struct iio_dev *indio_dev)
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{
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return 0;
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}
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static inline void iio_buffers_free_sysfs_and_mask(struct iio_dev *indio_dev) {}
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static inline void iio_disable_all_buffers(struct iio_dev *indio_dev) {}
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static inline void iio_buffer_wakeup_poll(struct iio_dev *indio_dev) {}
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static inline void iio_device_detach_buffers(struct iio_dev *indio_dev) {}
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#endif
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int iio_device_register_eventset(struct iio_dev *indio_dev);
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void iio_device_unregister_eventset(struct iio_dev *indio_dev);
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void iio_device_wakeup_eventset(struct iio_dev *indio_dev);
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struct iio_event_interface;
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bool iio_event_enabled(const struct iio_event_interface *ev_int);
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#endif
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